condition mean min max ZT0-3 9.15788 9.15788 9.15788 ZT4-7 7.838475 7.838475 7.838475 ZT8-11 6.564579999999999 6.564579999999999 6.564579999999999 ZT12-15 8.663525 8.663525 8.663525 ZT16-19 7.6259 7.6259 7.6259 ZT20-23 8.43266 8.43266 8.43266